ios 为什么错误日志一直在变

: * NSForwarding: warning: selector (0x280e022b) for message 'ayer' does not match selector known to Objective C runtime (0x175f4f70)-- abort
: +[NSString ayer]: unrecognized selector sent to class 0x3827ae7c
: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSString ayer]: unrecognized selector sent to class 0x3827ae7c'

这是第一次的错 那个ayer根本没有

: +[NSString olor]: unrecognized selector sent
: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSString olor]:

这是第二次的错 那个olor方法也没有

: +[NSString ions]: unrecognized selector sent
: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSString ions]:

这是第三次的错 那个ions方法也没有

这个该怎么去定位错误 解决啊